21435+2721
- Unique Name: 21435+2721OSO 155DG
- RA: 21 43 57.12
- Dec: +27 23 23.9
- Discoverer: OSO
- Discoverer Number: 155
- Components: DG
- First year: 1994
- Last year: 2002
- Observations: 5
- First position angle: 308
- Last position angle: 308
- First separation: 5.1
- Last separation: 5.0
- Mag first component: 10.19
- Mag second component: 17.1
- Spectral type: F6
- Primary proper motion RA: -240
- Primary proper motion DEC: 159
- Secondary proper motion RA: -240
- Secondary proper motion DEC: -159
- Durchmusterung: +26 4251
- Notes: NV
